curl --request GET \
  --url https://api.example.com/api/billing-groups/{billingGroupId}

{
  "id": 123,
  "clientName": "<string>",
  "primaryContactName": "<string>",
  "countryName": "<string>",
  "createdByUserID": 123,
  "createdByUserName": "<string>",
  "createdDate": "2023-11-07T05:31:56Z",
  "updatedByUserID": 123,
  "updatedByUserName": "<string>",
  "updatedDate": "2023-11-07T05:31:56Z",
  "clientID": 123,
  "name": "<string>",
  "primaryContactID": 123,
  "address1": "<string>",
  "address2": "<string>",
  "address3": "<string>",
  "suburb": "<string>",
  "state": "<string>",
  "postcode": "<string>",
  "country": "<string>",
  "description": "<string>"
}